Proton Doc Suggesting feature
I love this idea but it's falling just a bit short. Where the idea is falling short is that it allows people to make a copy of the document to use as their own. As an author, this petrifies me.
A Commenter role in addition to the viewer and editor role would be fabulous. The commenter role would have the ability to make suggestions to the document like with the suggesting feature but no ability to copy text or make copies of the document itself.

Suggestion mode is now available.
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Sara commented
You didn't read further than the Subject line because this feature is nice but seriously lacking. The ability to share a document that the receiver cannot copy from or make a copy of is needed. It needs to be a part of the roles granted when sharing not an option that must be chosen inside the document that anyone who views it can turn on and off.